Pep Guardiola's men were dominant in their final friendly ahead of next week's big kick-off at Brighton and goals by Gabriel Jesus, Sergio Aguero and substitute Raheem Sterling reflected their superiority.

After losing their opening pre-season game against rivals Manchester United in the United States, they have thrashed Real Madrid, Tottenham and now the Hammers, scoring 10 goals and conceding just one.

But while Guardiola's men are moving through the gears, Slaven Bilic still has work to do ahead of the trip to Old Trafford on Sunday week.

Gabriel Jesus opens the scoring (Image: Getty Images Europe)

Aguero started and scored also (Image: Getty Images Europe)

Bilic has brought in City keeper Joe Hart on loan and has also recruited former Etihad favourite Pablo Zabaleta as well as Marko Arnautovic and Javier Hernandez.

But the Londoners look like a work in progress – and their only win in six pre-season games has been against Fulham.

Here are 5 things we learned from Reykjavik:

1. There are no excuses for Pep Guardiola

Guardiola must bring the title with his squad (Image: REUTERS)

The strength of Manchester City's squad was illustrated on the hour when he made seven subs.

2. Ederson looks at home

With England's No.1 looking on at one end after being allowed to join the Hammers on loan, the Brazilian sweeper-keeper skilfully ventured from his box to chest the ball away from Tony Martinez before playing a smart pass down the line to Leroy Sane.

3. A big year for Hart

Joe Hart was beaten three times, though he had little chance with any of the goals (Image: Getty Images Europe)

Hart had no hope with City's goals, but he did make some smart saves and could be a key man for West Ham this season.

Hart's full-length stop to tip away a David Silva blast that seemed destined to find the bottom corner was top class.

It's a big year for the England keeper with the World Cup on the horizon.

4. Bilic still searching

It's not quite right yet (Image: REUTERS)

Bilic will need time to find the right blend.

The Hammers boss has recruited well this summer, but while players like Arnautovic, Hernandez, Hart and Zabaleta will bring undoubted quality to the West Ham team, it is hoped that the club's board realise that they may have to stay patient.

5. Pep's back three

Kompany was one of three starting centre-halves (Image: Getty Images Europe)

The three-man defensive set-up that formed the formidable base for Antonio Conte's championship success at Chelsea last season is catching on.

Guardiola employed it here, with Vincent Kompany and Nicolas Otamendi playing either side of John Stones.

The system has also been used by Manchester United and Arsenal in pre-season.